VRChat uses the following mime types when uploading files.
| Extension | Mime Type | Description |
|---|---|---|
| vrcw | application/x-world | This is the extension for world asset |
| vrca | application/x-avatar | This is the extension for avatar asset |
| dll | application/x-msdownload | This is for DLLs, right now only found in worlds pluginUrl |
| unitypackage | application/gzip | can be opened by unity and imported to project |
| gz | application/gzip | never used |
| jpg | image/jpg | image |
| png | image/png | image |
| sig | application/x-rsync-signature | unknown |
| delta | application/x-rsync-delta | unknown |
The default they use for any other file is application/octet-stream